II - 2
Processes and Functions
SM830052
2
1. Compressor Control
1-1. Compressor capacity control
(1) Compressor usage by model
Outdoor unit capacity 28 kw outdoor unit 22.4 kw outdoor unit
14 kw outdoor unit
Type of compressor P/C compressor AC compressor P/C compressor AC compressor P/C compressor
Compressor capacity 14 kw 14 kw 11.2 kw 11.2 kw 14 kw
(2) Compressor capacity control
The compressor capacity control is achieved by switching on and off the P/C compressor, AC compressor, low-
pressure valve, high-pressure valve, and external save valve following the current capacity obtained through the
calculation procedure below.
¶ Serial capacity calculation (calculated from indoor unit capacity with thermo-on
and the difference between temperature setting and room temperature)
↓
¶ Aid-capacity calculation (Calculation from operating condition)
↓
¶ Upper limit capacity (= serial capacity + aid-capacity)
↓
¶ Calculation of current capacity (protective control, etc., added)
↓
¶ The compressor electromagnetic contactor (52 C), low-pressure valve, high-pressure valve, and save
valve output are set according to the current capacity.
Occasionally, some special-purpose control is added.
(3) Relationship between current capacity and outputs
1 50-Hz 14 kw outdoor unit (SPW-C483GYH8, SPW-C483GY8)
Current capacity (kw) 0 3.5 7 10.5 14
52C OFF ON ON ON ON
Low-pressure valve ON ON ON OFF OFF
High-pressure valve OFF OFF OFF ON ON
Save valve ON ON OFF ON OFF
2 50-Hz 22.4 kw outdoor unit (SPW-C703GYH8, SPW-C703GY8)
Current capacity (kw) 0 2.8 5.6 8.4 11.2 14 16.8 19.6 22.4
52C OFF ON ON ON ON ON ON ON ON
Low-pressure valve ON ON ON OFF OFF ON ON OFF OFF
High-pressure valve OFF OFF OFF ON ON OFF OFF ON ON
11.2 kw compressor (AC) OFF OFF OFF OFF OFF ON ON ON ON
Save valve ON ON OFF ON OFF ON OFF ON OFF
3 50-Hz 28 kw outdoor unit (SPW-C903GYH8, SPW-C903GY8)
Current capacity (kw) 0 3.5 7 10.5 14 17.5 21 24.5 28
52C OFF ON ON ON ON ON ON ON ON
Low-pressure valve ON ON ON OFF OFF ON ON OFF OFF
High-pressure valve OFF OFF OFF ON ON OFF OFF ON ON
14 kw compressor (AC) OFF OFF OFF OFF OFF ON ON ON ON
Save valve ON ON OFF ON OFF ON OFF ON OFF
(4) AC compressor start delay (for outdoor units)
When two compressors are to be started, the AC compressor is started 15 seconds after the P/C compressor.
(22.4 kw, 28 kw outdoor units)
(5) For compressors, when a compressor is stopped, it is not restarted for 3 minutes. During this period, the current
capacity does not increase. However, stops before and after reverse-cycle starting and reverse-cycle defrosting
are excluded from this rule.
14 kw
compressor
(P/C)
11.2 kw
compressor
(P/C)
14 kw
compressor
(P/C)
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